LTC3552-1 Linear Technology, LTC3552-1 Datasheet - Page 6

• Manufacturer Part Number: LTC3552-1
• Description: Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter
• Manufacturer: Linear Technology

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200mA/DIV
LTC3552-1
TYPICAL PERFOR A CE CHARACTERISTICS
Switching Regulator
6
20mV/DIV
RIPPLE
5V/DIV
V
–0.2
–0.4
–0.6
–0.8
–1.0
100
OUT1
1.0
0.8
0.6
0.4
0.2
95
90
85
80
75
70
65
60
SW
0
–50
I
L
2
Burst Mode Operation
Effi ciency vs Supply Voltage
Output Voltage Error
vs Temperature
V
V
Burst Mode OPERATION
CIRCUIT OF FIGURE 2
V
V
I
REGULATOR 1; CIRCUIT OF FIGURE 2
CC
LOAD
OUT1
CC
OUT1
2.5
–25
= 3.6V
= 3.6V
= 1.8V, REGULATOR 1
= 60mA
= 1.8V
3
0
TEMPERATURE (°C)
3.5
25
V
CC
2µs/DIV
4
(V)
50
4.5
I
I
I
I
75
OUT
OUT
OUT
OUT
W
5
= 1mA
= 10mA
= 100mA
= 800mA
100
5.5
35521 G17
35521 G20
35521 G14
U
125
6
200mV/DIV
500mA/DIV
500mA/DIV
800mA
I
80mA-
V
LOAD
OUT1
500
450
400
350
300
250
200
2.5
2.4
2.3
2.2
2.1
2.0
I
:
L
–50
1
Oscillator Frequency
vs Temperature
R
V
V
I
REGULATOR 1; CIRCUIT OF FIGURE 2
Load Step
LOAD
V
CC
OUT1
DS(ON)
CC
SYNCHRONOUS
–25
= 3.6V
= 3.6V
= 80mA TO 800mA
= 1.8V
2
SWITCH
vs Supply Voltage
0
TEMPERATURE (°C)
3
MAIN
SWITCH
25
20µs/DIV
V
CC
4
(V)
50
5
75
100
6
T
A
35521 G15
35521 G21
35521 G18
= 25°C Unless Otherwise Specifi ed.
125
7
200mV/DIV
200mA/DIV
200mA/DIV
400mA
40mA-
V
I
LOAD
OUT2
–10
550
500
450
400
350
300
250
200
150
100
– 2
– 4
– 6
– 8
10
8
6
4
2
0
I
–50
L
2
Oscillator Frequency Error
vs Supply Voltage
R
V
V
I
REGULATOR 2; CIRCUIT OF FIGURE 2
Load Step
LOAD
DS(ON)
CC
OUT2
–25
= 3.6V
= 40mA TO 400mA
= 1.575V
MAIN SWITCH
SYNCHRONOUS SWITCH
JUNCTION TEMPERATURE (°C)
V
CC
3
vs Junction Temperature
0
= 4.2V
25
V
20µs/DIV
CC
V
CC
50
4
(V)
= 3.6V
V
CC
75
= 2.7V
100
5
125
35521f
35521 G19
35521 G16
35521 G22
150
6